Function handle_trace_call_path

src/mcp/mcp.c:6332–6726

}

static char *handle_trace_call_path(cbm_mcp_server_t *srv, const char *args) {
    char *func_name = cbm_mcp_get_string_arg(args, "function_name");
    char *project = get_project_arg(args);
    cbm_store_t *store = resolve_store(srv, project);
    char *direction = cbm_mcp_get_string_arg(args, "direction");
    char *mode = cbm_mcp_get_string_arg(args, "mode");
    char *param_name = cbm_mcp_get_string_arg(args, "parameter_name");
    int depth = cbm_mcp_get_int_arg(args, "depth", MCP_DEFAULT_DEPTH);
    depth = clamp_mcp_depth(depth, "trace_call_path");
    /* Per-direction node budget for the BFS working set. The old fixed
     * MCP_BFS_LIMIT silently truncated hub traces at 100 nodes with no
     * signal; now the limit is a documented parameter and hitting it emits
     * `truncated: true` (never a silent truncation — same policy as the
     * depth clamp, #887). */
    int trace_limit = cbm_mcp_get_int_arg(args, "limit", MCP_BFS_LIMIT);
    if (trace_limit < 1) {
        trace_limit = 1;
    }
    if (trace_limit > MCP_BFS_LIMIT_MAX) {
        trace_limit = MCP_BFS_LIMIT_MAX;
    }
    bool risk_labels = cbm_mcp_get_bool_arg(args, "risk_labels");
    bool include_tests = cbm_mcp_get_bool_arg(args, "include_tests");
    /* Off by default: two extra columns on every row is exactly the kind of
     * inflation the tree format exists to avoid. Opt in when you need to judge
     * whether an edge is trustworthy. */
    bool include_evidence = cbm_mcp_get_bool_arg(args, "include_evidence");

    if (!func_name) {
        free(project);
        free(direction);
        free(mode);
        free(param_name);
        return cbm_mcp_text_result("function_name is required", true);
    }
    if (!store) {
        char *_err = build_project_list_error("project not found or not indexed");
        char *_res = cbm_mcp_text_result(_err, true);
        free(_err);
        free(func_name);
        free(project);
        free(direction);
        free(mode);
        free(param_name);
        return _res;
    }

    char *not_indexed = verify_project_indexed(store, project);
    if (not_indexed) {
        free(func_name);
        free(project);
        free(direction);
        free(mode);
        free(param_name);
        return not_indexed;
    }

    /* Pagination: decode + validate the resume cursor (if any) against the